There was interest when SVB was solvent. Right now, SVB has negative value. E.g. you'd need to buy SVB for X and then pay an additional Y to balance the books. Y is likely to be a certain percentage of deposits and could be quite large. The only groups that will be interested in SVB are likely VC funds that are worried about an SVB collapse disrupting operations at the VC's startups.
For making customer deposits whole, someone will get to become an iconic bay area institution.
Not worth $20B to me, but there are dozens of vain people with billions that may disagree.
A Bloomberg reporter said that Goldman people had told her many times that they would love to own SVB, but that it was too expensive. Not anymore!